When to go · Cornwall, Ontario
Cornwall, Ontario in September
Great month. Inside Cornwall, Ontario's best window: Jun–Sep.
Key facts
- Verdict
- Great
- Temperature
- 22°C (72°F)72°F (22°C) / 12°C (53°F)53°F (12°C)
- average high / low
- Rain days
- 12
- Crowds
- Medium
- Canada overall
- Prices
- Medium
- Canada overall
Verdict
Inside Cornwall, Ontario's best window: Jun–Sep.
Is another month better than September?
No other month rates higher than September for Cornwall, Ontario in this guide.
Weather in September
- Cornwall, OntarioHighs around 22 °C (72 °F), lows around 11.8 °C (53 °F), rain on about 12 daysHighs around 72 °F (22 °C), lows around 53 °F (11.8 °C), rain on about 12 days
Crowds and prices
- Crowds · Canada overall
- Medium
- Prices · Canada overall
- Medium
Canada overall: After Labour Day crowds drop; larches turn gold in the Rockies late in the month.
Compare two months
Weather, crowds and prices for any two months in Cornwall, Ontario, side by side.
Verdict
Sep: Great
Jun: Great
Daytime high
Sep: 22 °C (72 °F)72 °F (22 °C)
Jun: 24.6 °C (76 °F)76 °F (24.6 °C)
Night low
Sep: 11.8 °C (53 °F)53 °F (11.8 °C)
Jun: 14.1 °C (57 °F)57 °F (14.1 °C)
Rain days
Sep: 12 (better)
Jun: 13
Crowds
Sep: Medium
Jun: Medium
Prices
Sep: Medium
Jun: Medium
Festivals listed
Sep: 0
Jun: 1
September: Inside Cornwall, Ontario's best window: Jun–Sep.
June: Inside Cornwall, Ontario's best window: Jun–Sep.
Cornwall, Ontario: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings
- A rain jacket or umbrella and shoes that dry fast